Process for manufacturing lacs from derivatives of cellulose.



rnonon 'LEHMANN AND JOHANNE S STOCKER, OF BERLIN, 'GERMANY.

PROCESS FOR MANUFACTURING LACS FROM DERIVATIVES O F CELLULOSE NoDrawing.

' To all whom it may concern:

Be it known that we, FEODOR LEHMANN and J OHANNES STOGKER, man Emperor,and residents OfBQIllIl, many, have invented certain new and usefulImprovements in Processesfor Manufacturing Lacs from Derivatives ofCellulose, of which the following is a specification.

The invention relates 'to a process for manufacturing lacs fromderivatives of cellulose.

The process consists in dissolving the derivatives of cellulose insuitable liquids such as methyl alcohol, acetone oil, ketones or thelike after having previously added a benzol-, alcoholor the likesolution of polymerization products of cumarone or indene or a mixtureofboth or the resinous substances obtained when refining tar oils, (theso called cumarone resin) or equivalent or similar products, (whichpolymerization products may be previously purified if necessary). Incarrying out said process, the so called cumarone resin is to beconsidered in the first instance; it is produced when refining benzolhydrocarbons and mainly composed of a mixture of the products ofpolymerization of cumarone and .indene. A lac is obtained which flowslike oil, is bright, dries uniformly, is highly elastic and airandlight-proof.

When derivatives of cellulose are dissolved in the first named liquids,a clear solution is obtained, but after drying a white opaque layer isleft remaining; when the mentioned products of polymerization of thecumarone and indene have been added, not only the above cited advantagesare secured, but said layer keeps clear as water after drying.Consequently the adding of the prod ucts of polymerization indene is nota question of providing an equivalent substitute for the resinsheretofore used in manufacturing lacs, but a surprising novel factoccurs, consisting in that the products of polymerization of theonmarone, and indene provide, when used with the derivativesofcellulose, new compounds, unknown before as industrial products andhaving very valuable technical properties.

Exam/plea I. 10 grams of cumarone resin are dis- Specification ofLetters Patent.

subjects of'the Ger- Ger-' ing tar oils.

of the cumarone and Patented May 30, 1916.

Application filed April 13, 1914. Serial No. 831,617.

solved in grams of benzol and added toal1qu1d composed of a solution of30 grams of collodlon cotton 5 grams of acetone-oil, 100 grams ofalcohol and 100 grams of ketones. The resulting liquid mass is dilutedwith 300 grams of alcohol, 300 grams of benzin and 100 grams of methylalcohol.

II. 10 grams of cumarone resin are dissolved in a mixture of :25 gramsof fusel-oil and 25 grams of tetra-chlorethane. Said mixture is added toa mixture of 600 grams of acetone and 300 grams of methylic alcohol. 40grams of acetylcellulose are then dissolved in the resulting liquidmixture.

Of course the above proportions are only given by way of example; theyvary between large limits according to the desired properties of thelacs to be manufactured.

Having now fully described our said invention, what we claim and desireto secure by Letters Patent, is:

1. Process for manufacturing lacs from derivatives of celluloseconsisting in adding to said derivatives compounds of cumarone andindene polymerization products.

2. Process for manufacturing lacs from derivatives of celluloseconsisting in adding to said derivatives the resinous cumaronecontaining substances obtained when refin- 3. A process formanufacturing lacs from derivatives of cellulose which consists inadding to said derivatives a solution of cumarone and indenepolymerization products in acetone oil, and subsequently diluting saidsolution with benzol.

4. A process for manufacturing lacs from derivatives of cellulose whichconsists in adding to said derivatives a solution of enmarone and indenepolymerization products in a' ketone, and subsequently diluting saidsolution with benzol.

5. Process for manufacturing lacs which consists in dissolvingderivatives of cellulose and cumarone and indene polymerization productsin a solvent and subsequently diluting the solution. 1

In testimony whereof we have hereunto set our hands in presence of twowitnesses.

FEODOR LEH'MANN. JOHANNES STOCKER. Witnesses:

VVOLDEMAR HAUPT, HENRY HAsrnR.

